大佬教程收集整理的这篇文章主要介绍了在带有自定义 CDI 拦截器的 bean 上使用 OmniFaces @Param 时如何正确解析 NPE，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我想在带有自定义 CDI 拦截器注释的视图控制器上使用 OmniFaces @Param：
@named
@javax.faces.vIEw.VIEwScoped
@CustomInterceptor
public class Controller implements serializable {
@Param(required = truE)
private String token;
@postconstruct
public voID initialize() {
// use this.token
}
}
自定义 CDI 拦截器：
@CustomAnnotation
@Interceptor
@Priority(Interceptor.Priority.APPliCATION)
@Dependent
public class CustomInterceptor implements serializable {
@postconstruct
private Object initialize(InvocationContext invocationContext) throws Exception {
// some code
return invocationContext.proceed();
}
@AroundInvoke
private Object intercept(InvocationContext invocationContext) throws Exception {
// some code
return invocationContext.proceed();
}
@PreDestroy
private Object shutdown(InvocationContext invocationContext) throws Exception {
// some code
return invocationContext.proceed();
}
}
和自定义注解：
@inherited
@InterceptorBinding
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface CustomAnnotation {}
在视图的运行时请求中，我得到了一个带有此堆栈跟踪的 NPE：
SEVERE [javax.enterprise.resource.webcontainer.Jsf.application] (default task-1) Error Rendering VIEw[vIEw.xhtml]: java.lang.NullPointerException
at deployment//org.omnifaces.cdi.param.ParamProducer.dobeanValIDation(ParamProducer.java:455)
at deployment//org.omnifaces.cdi.param.ParamProducer.valIDateBean(ParamProducer.java:359)
at deployment//org.omnifaces.cdi.param.ParamProducer.invokeValIDators(ParamProducer.java:338)
at deployment//org.omnifaces.cdi.param.ParamProducer.lambda$valIDateValues$1(ParamProducer.java:325)
at deployment//org.omnifaces.cdi.param.ParamProducer.runWithSimulatedLabelAndValueOnVIEwRoot(ParamProducer.java:258)
at deployment//org.omnifaces.cdi.param.ParamProducer.valIDateValues(ParamProducer.java:325)
at deployment//org.omnifaces.cdi.param.ParamProducer.produce(ParamProducer.java:107)
at deployment//org.omnifaces.cdi.param.ParamExtension$ParamInjectionTarget.inject(ParamExtension.java:123)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:161)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.util.bean.IsolatedForWARDingBean.create(IsolatedForWARDingBean.java:45)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.application.vIEw.VIEwScopeContextManager.createBean(VIEwScopeContextManager.java:142)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.application.vIEw.VIEwScopeContext.get(VIEwScopeContext.java:114)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.contexts.PassivaTingContextwrapper$AbstractPassivaTingContextwrapper.get(PassivaTingContextwrapper.java:84)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.bean.ContextualinstanceStrategy$DefaultContextualinstanceStrategy.get(ContextualinstanceStrategy.java:100)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.bean.Contextualinstance.get(Contextualinstance.java:50)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.manager.beanManagerImpl.getReference(BeanManagerImpl.java:694)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.module.web.el.AbstractWeldELResolver.lookup(AbstractWeldELResolver.java:107)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.module.web.el.AbstractWeldELResolver.getValue(AbstractWeldELResolver.java:90)
at org.jboss.as.Jsf-injection//org.jboss.as.Jsf.injection.weld.ForWARDingELResolver.getValue(ForWARDingELResolver.java:46)
at javax.el.API@2.0.0.Final//javax.el.CompositeELResolver.getValue(CompositeELResolver.java:136)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:156)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:184)
at org.glassfish.jakarta.el@3.0.3.jbossorg-2//com.sun.el.parser.AstIDentifIEr.getValue(AstIDentifIEr.java:91)
at org.glassfish.jakarta.el@3.0.3.jbossorg-2//com.sun.el.parser.AstValue.getBase(AstValue.java:125)
at org.glassfish.jakarta.el@3.0.3.jbossorg-2//com.sun.el.parser.AstValue.getValue(AstValue.java:173)
at org.glassfish.jakarta.el@3.0.3.jbossorg-2//com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:183)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.module.web.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
at org.jboss.weld.core@3.1.5.Final//org.jboss.weld.module.web.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.facelets.el.TagValueExpression.getValue(tagValueExpression.java:73)
at javax.faces.API@3.0.0.SP04//javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:170)
at javax.faces.API@3.0.0.SP04//javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:157)
at javax.faces.API@3.0.0.SP04//javax.faces.component.uioutput.getValue(uioutput.java:140)
at javax.faces.API@3.0.0.SP04//javax.faces.component.UIinput.getValue(UIinput.java:287)
at deployment//org.primefaceS.Util.ComponentUtils.getValuetoRender(ComponentUtils.java:104)
at deployment//org.primefaceS.Util.ComponentUtils.getValuetoRender(ComponentUtils.java:68)
at deployment//org.primefaces.component.inputtext.inputTextRenderer.encodeMarkup(inputTextRenderer.java:96)
at deployment//org.primefaces.component.inputtext.inputTextRenderer.encodeEnd(inputTextRenderer.java:67)
at javax.faces.API@3.0.0.SP04//javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:595)
at javax.faces.API@3.0.0.SP04//javax.faces.component.UIComponent.encodeAll(UIComponent.java:1654)
at javax.faces.API@3.0.0.SP04//javax.faces.render.Renderer.encodeChildren(Renderer.java:152)
at javax.faces.API@3.0.0.SP04//javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:566)
at javax.faces.API@3.0.0.SP04//javax.faces.component.UIComponent.encodeAll(UIComponent.java:1647)
at javax.faces.API@3.0.0.SP04//javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650)
at javax.faces.API@3.0.0.SP04//javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.application.vIEw.FaceletVIEwHandlingStrategy.renderVIEw(FaceletVIEwHandlingStrategy.java:468)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.application.vIEw.multiviewHandler.renderVIEw(multiviewHandler.java:170)
at javax.faces.API@3.0.0.SP04//javax.faces.application.VIEwHandlerWrapper.renderVIEw(VIEwHandlerWrapper.java:132)
at javax.faces.API@3.0.0.SP04//javax.faces.application.VIEwHandlerWrapper.renderVIEw(VIEwHandlerWrapper.java:132)
at javax.faces.API@3.0.0.SP04//javax.faces.application.VIEwHandlerWrapper.renderVIEw(VIEwHandlerWrapper.java:132)
at deployment//org.omnifaces.vIEwhandler.omniVIEwHandler.renderVIEw(OmniVIEwHandler.java:155)
at javax.faces.API@3.0.0.SP04//javax.faces.application.VIEwHandlerWrapper.renderVIEw(VIEwHandlerWrapper.java:132)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:102)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.lifecycle.Phase.dophase(Phase.java:76)
at com.sun.Jsf-impl@2.3.14.SP02//com.sun.faces.lifecycle.lifecycleImpl.render(lifecycleImpl.java:199)
at javax.faces.API@3.0.0.SP04//javax.faces.webapp.FacesServlet.executelifecyle(FacesServlet.java:708)
at javax.faces.API@3.0.0.SP04//javax.faces.webapp.FacesServlet.service(FacesServlet.java:451)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletHandler.handlerequest(ServletHandler.java:74)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at io.opentracing.contrib.opentracing-jaxrs2//io.opentracing.contrib.jaxrs2.server.SpanFinishingFilter.doFilter(SpanFinishingFilter.java:52)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at deployment//org.omnifaces.facesvIEws.FacesVIEwsForWARDingFilter.filterExtensionLesstoExtension(FacesVIEwsForWARDingFilter.java:180)
at deployment//org.omnifaces.facesvIEws.FacesVIEwsForWARDingFilter.filterExtensionLess(FacesVIEwsForWARDingFilter.java:137)
at deployment//org.omnifaces.facesvIEws.FacesVIEwsForWARDingFilter.filterExtensionLess(FacesVIEwsForWARDingFilter.java:123)
at deployment//org.omnifaces.facesvIEws.FacesVIEwsForWARDingFilter.doFilter(FacesVIEwsForWARDingFilter.java:84)
at deployment//org.omnifaces.filter.httpFilter.doFilter(httpFilter.java:108)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.FilterHandler.handlerequest(FilterHandler.java:84)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handlerequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletChain$1.handlerequest(ServletChain.java:68)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServletdispatchingHandler.handlerequest(ServletdispatchingHandler.java:36)
at org.wildfly.security.elytron-web.undertow-server@1.8.0.Final//org.wildfly.elytron.web.undertow.server.elytronRunAsHandler.lambda$handlerequest$1(elytronRunAsHandler.java:68)
at org.wildfly.security.elytron-private@1.14.1.Final//org.wildfly.security.auth.server.FlexiblEIDentityAssociation.runAsFunctionEx(FlexiblEIDentityAssociation.java:103)
at org.wildfly.security.elytron-private@1.14.1.Final//org.wildfly.security.auth.server.Scoped.runAsFunctionEx(Scoped.java:161)
at org.wildfly.security.elytron-private@1.14.1.Final//org.wildfly.security.auth.server.Scoped.runAs(Scoped.java:73)
at org.wildfly.security.elytron-web.undertow-server@1.8.0.Final//org.wildfly.elytron.web.undertow.server.elytronRunAsHandler.handlerequest(elytronRunAsHandler.java:67)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.RedirectDirHandler.handlerequest(RedirectDirHandler.java:68)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.SSLinformationAssociationHandler.handlerequest(SSLinformationAssociationHandler.java:117)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handlerequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PreDicateHandler.handlerequest(PreDicateHandler.java:43)
at io.undertow.core@2.2.4.Final//io.undertow.security.handlers.AuthenticationConsTraintHandler.handlerequest(AuthenticationConsTraintHandler.java:53)
at io.undertow.core@2.2.4.Final//io.undertow.security.handlers.AbstractConfIDentialityHandler.handlerequest(AbstractConfIDentialityHandler.java:46)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.ServletConfIDentialityConsTraintHandler.handlerequest(ServletConfIDentialityConsTraintHandler.java:64)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.security.ServletSecurityConsTraintHandler.handlerequest(ServletSecurityConsTraintHandler.java:59)
at io.undertow.core@2.2.4.Final//io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handlerequest(AbstractSecurityContextAssociationHandler.java:43)
at org.wildfly.security.elytron-web.undertow-server-servlet@1.8.0.Final//org.wildfly.elytron.web.undertow.server.servlet.CleanUpHandler.handlerequest(CleanUpHandler.java:38)
at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PreDicateHandler.handlerequest(PreDicateHandler.java:43)
at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.security.jacc.JACCContextIDHandler.handlerequest(JACCContextIDHandler.java:61)
at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PreDicateHandler.handlerequest(PreDicateHandler.java:43)
at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.GlobalrequestControllerHandler.handlerequest(GlobalrequestControllerHandler.java:68)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.SendErrorPageHandler.handlerequest(SendErrorPageHandler.java:52)
at io.undertow.core@2.2.4.Final//io.undertow.server.handlers.PreDicateHandler.handlerequest(PreDicateHandler.java:43)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServleTinitialHandler.handleFirstrequest(ServleTinitialHandler.java:269)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServleTinitialHandler.access$100(ServleTinitialHandler.java:78)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServleTinitialHandler$2.call(ServleTinitialHandler.java:133)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServleTinitialHandler$2.call(ServleTinitialHandler.java:130)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ServletrequestContextThreadSetupAction$1.call(ServletrequestContextThreadSetupAction.java:48)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymenTinfoservice$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymenTinfoservice.java:1530)
at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymenTinfoservice$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymenTinfoservice.java:1530)
at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymenTinfoservice$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymenTinfoservice.java:1530)
at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymenTinfoservice$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymenTinfoservice.java:1530)
at org.wildfly.extension.undertow@22.0.1.Final//org.wildfly.extension.undertow.deployment.UndertowDeploymenTinfoservice$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymenTinfoservice.java:1530)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServleTinitialHandler.dispatchrequest(ServleTinitialHandler.java:249)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServleTinitialHandler.access$000(ServleTinitialHandler.java:78)
at io.undertow.servlet@2.2.4.Final//io.undertow.servlet.handlers.ServleTinitialHandler$1.handlerequest(ServleTinitialHandler.java:99)
at io.undertow.core@2.2.4.Final//io.undertow.server.Connectors.executeRootHandler(Connectors.java:387)
at io.undertow.core@2.2.4.Final//io.undertow.server.httpServerExchange$1.run(httpServerExchange.java:841)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
at org.jboss.xnio@3.8.4.Final//org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1280)
at java.base/java.lang.Thread.run(Thread.java:834)
我在 OpenJDK 11.0.9.1+1、WildFly 22.0.1.Final、OmniFaces 3.10.1 上运行（如果它确实重要，请使用 PrimeFaces 10.0.0-RC1）
由于 this question，我将 disableBeanValIDation = true 添加到 @Param 并且不会抛出 NPE。但这感觉就像我首先做错了什么（关于这个的 Javadoc 也有点过时了）。
此外，如果我省略自定义 CDI 拦截器（这对我来说不是一个选项），则根本不会抛出 NPE。
如何正确解决这个问题？我做错了什么还是这是一个错误，也许？
这是 OmniFaces @Param 中的一个错误，从 3.6 版开始，在从 @Inject 中删除 @Param 要求的工作中就表现出来了。当托管 bean 被代理为拦截器目标时，它无法正常工作。托管 bean 的 Object#getClass() 返回代理类，而 BeanManager#resolve() 找不到此代理类的 Bean<X> 并返回 null。这种意外情况最终导致执行 bean 验证时出现 NullPointerException。
根据 fixed，它已经 issue 624，将在 OmniFaces 3.11 和 4.0-M8 中可用。
与此同时，解决方法是将 @Inject 添加回您的 @Param。
@Inject @Param(required = truE)
private String token;
以上是大佬教程为你收集整理的在带有自定义 CDI 拦截器的 bean 上使用 OmniFaces @Param 时如何正确解析 NPE全部内容，希望文章能够帮你解决在带有自定义 CDI 拦截器的 bean 上使用 OmniFaces @Param 时如何正确解析 NPE所遇到的程序开发问题。
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